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A Study on MG-PMSM for High Torque Density of 45 kW–Class Tram Driving System

Author

Listed:
  • Ik-Hyun Jo

    (Department of Electrical Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea)

  • Ju Lee

    (Department of Electrical Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea)

  • Hyung-Woo Lee

    (School of Railway Engineering, Korea National University of Transportation, 157, Cheoldobangmulgwan-ro, Uiwang-si 16106, Korea)

  • Jae-Bum Lee

    (School of Railway Engineering, Korea National University of Transportation, 157, Cheoldobangmulgwan-ro, Uiwang-si 16106, Korea)

  • Jae-Hyeon Lim

    (School of Railway Engineering, Korea National University of Transportation, 157, Cheoldobangmulgwan-ro, Uiwang-si 16106, Korea)

  • Seong-Hwi Kim

    (School of Railway Engineering, Korea National University of Transportation, 157, Cheoldobangmulgwan-ro, Uiwang-si 16106, Korea)

  • Chan-Bae Park

    (School of Railway Engineering, Korea National University of Transportation, 157, Cheoldobangmulgwan-ro, Uiwang-si 16106, Korea)

Abstract

This paper reports the design of a magnetic-geared permanent magnet synchronous motor (MG-PMSM) for a 45 kW tram traction system based on high torque density. In the case of the existing tram driving system, due to mechanical reduction gear and induction motor, it causes power transmission loss, low efficiency, and difficulty in lightweight. To solve this problem, research on the MG-PMSM, which combines a contactless magnetic gear with a high-power-density PMSM, is being actively conducted. This motor has a double rotor structure, and the inner rotor, including permanent magnet, and the outer rotor composed of pole-pieces rotate at different mechanical speeds. However, it is hard to design a tram driving system with a high torque density within limited conditions, because only one rotor in MG-PMSM is used as an output. In addition, there is no study conducted from basic design to final design, including gear ratio and topology selection in MG-PMSM for tram. Therefore, this paper presents the design process of MG-PMSM with high torque density to be applied to the 45 kW–class tram driving system. After designing the magnetic gear part that increases torque and efficiency by selecting an appropriate topologies-and-gear ratio that meets the constraints, the final finite elements method (FEM) model and electromagnetic field analysis results were derived by considering the number of poles and the number of slots. Through this, we confirmed that it is superior in output characteristics compared to the existing induction motor + mechanical gear.

Suggested Citation

  • Ik-Hyun Jo & Ju Lee & Hyung-Woo Lee & Jae-Bum Lee & Jae-Hyeon Lim & Seong-Hwi Kim & Chan-Bae Park, 2022. "A Study on MG-PMSM for High Torque Density of 45 kW–Class Tram Driving System," Energies, MDPI, vol. 15(5), pages 1-13, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1749-:d:759486
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    References listed on IDEAS

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    1. Ming Cheng & Le Sun & Giuseppe Buja & Lihua Song, 2015. "Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles," Energies, MDPI, vol. 8(9), pages 1-24, September.
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